partial void DeleteTest_sub(Test_sub instance);
partial void InsertTest_sub(Test_sub instance);
partial void UpdateTest_sub(Test_sub instance);
private void attach_Test_sub(Test_sub entity) { this.SendPropertyChanging(); entity.Test_main = this; }
private void detach_Test_sub(Test_sub entity) { this.SendPropertyChanging(); entity.Test_main = null; }